Lighting fixture



March 7, 1933. J, B CHARTRAND 1,900,330

LIGHTING FIXTURE Filed Aug. 2l, 1931 2 Sheets-Sheet l /zj. f/ f4 I www ziy/m E. hanf/"52707 AMW @www March 7, 1933. B- CHARTRAND 1,900,330

LIGHTING FIXTURE' Filed Aug. 21, 1931 2 sheets-sheet 2 Patented Mar. 7, 1933 wm il en frATi-:s PATENT OFFICE,

sonni Bjciaiin'rnnni), oF ofci'ivnniinn curo, 'Assioivon fro LINE MATERIAZ. QOMPANY, or sourir iriLWr-suiinn, Wisconsin, .A CORPORATION on ni'iLAWARE LIGHTING FIXTURE Application lecl- August v21, 1931. Serial No.- 558,451.

This invention relates to certain new and useful improvements in lighting fixtures, rind has as a general object to lprovide improved means for Ventilating the interior s thereof.

In totally enclosed lighting fixtures the heat created by the lamp, especially When the large size lamps are employed, is appreciable, and very often causes not only failure of the lamp, but also failure of the shell and socket portion of the fixture as Well as breakage ofthe outer glassware due to rainfall. Y v

Attempts have been ina-dein the past to ventilato these fixtures, but heretofore all means proposed have been inadequate. To provide efficient ventilation, it is desirable that the heat directly adjacent the lamp be carried off Without coming inr contact With -3 the outer protective globe and it is, therefore, another object of this invention to provide means whereby two air channels are established, one Within the other, the inner one carrying oil? the heat directly from the lamp and the outer one providing a layer of cooler air to protect the outer glassware from excessive heat.

Aeine-ther object 1" this invention is 'to improve the ventilation of a lighting fixture f the character described by providing a chimney-like structure the hot air exhaust port in the outer globe to increase the velocity of the Ventilating air currents rising through the fixture.

T5 lVith the above and other objects in view whichl will appear as the desn-:ription'pro-` ceeds, trie invention resides in the novel construction, combination and arrangement of parts `substantiall as hereinafter de,-

Ic scribed and nio-re particularly defined bythe appended claims, it being understood that such changes in the precise embodiment of the herein disclosed invention may be made as come witiin the scope of theclai-nis.

The accompaiiying drawings illustrate several. completed examples of the physical ei'nbodiinent of the invention constructed acthereof, and in which:

Figure l is a View partially in -side elevation and partially in section of a lighting fixture embodying this invention; l

Figure 2 is a horizontal section view taken through Figure 1 on the plane of the line rFigure 3 is a horizontal section view taken l through Figure l .on the plane ofthe line 3- s f Figuren is a detail section view taken through Figure l on the plane of the line weg li iguie 5 is a View of "part of a lighting fixture similar to Figure l, but illustrating A a slightly modified construction; andy f K Figure 6 is a .vievv partially sideelevationand partially in section of a vslightly modified'form of chimney construetion.- l

Referring now more particularlyto the accompanying drawings, in which like nug inerals designate like parts throughout the several vevvs,\the numeral 6 represents the bodyV of a lighting fixture Which is substantially inverted beller cup shaped, and *hasy itsy closed bottom Wall provided with a threaded aperature 7 to `be adjust-ably secured en ,a tubular mounting member 8 sup,-

ported from va standard 9 or the like A plurality of openings 10, preferably in the form of elongated annular slots, are formed in the bottom Wall of thehousing to provide air inlet openings tothe interior of the body and substantially encircling the mounting member 8; p y l l A llamp receptacle 1l is supported from the-upper portion of the member' 8 to receive a lamp l12 which stands inY an upright position vwith its'A end portionprojected above the lopen top of the cup shaped body member Gand into a refractor bowl 13 positioned Lb'ove the upper openl end of the body memer..

TheA refractor bowl. is of conventional con-y struction andcomprises two telescoped glass members having their meeting surfacesprovided with prismatie eongurations to dif-A fuse the' light of the lamp, Aand the lower periphery thereof rests upon projections .14 extended inwardly froma ring 15P encircling the upper open end of the body mem-ber.`

The refractor bowl is held assembled with the ring by hook shaped members 16 engaged over an annular rim 17 formed on the peripheral edge of the refractor bowl and secured to the ring 15 by screws 18 or the like. Y

The ring 15 is of greater diameter than the adjacent portion of the body member to be spaced therefrom and is connected therewith by being h"` ged, as at 19, to an annular flange extent ed laterally from the top portion of the body member. A locking device 20 diametrically opposite the hinged connection 19 provides means for locking the ring down onto the flange.

As stated, the ring 15 is spaced from the vadjacent `portion of the body member and the flange 20 is provided with a plurality of arcuate slots or openings 21 to provide inlet openings to the space between the refractor and the linner wall of a protective glass globe 22 carried by the ring 15 and positioned over the refractor. The protective globe 22 is readily releasably secured on the ring 15 by a spring band 23 connected with the ring 15 and encircling the lower peripheral edge portion of the globe, the ring 15 being provided with a suitable packing 24 to protect the peripheral edge of the globe. Both the refractor bowl and the protective globe are thus carried by the ring 15, which being hingedly mounted from the body member,'enables the protective globe and the refractor to be simultaneously swung to open position to permit access to the interior of the iixture. It is observed that when the ring is in its closed position with the glassware properly positioned above the body member, the refractor bowl substantially contacts with tlre uppler peripheral edge of the body member so that the refractor and the body member form one continuous chamber in which the lamp is totally enclosed.

The top of the refractor has an air outlet opening 24 and the top portion of the protective globe 22 is provided with an outlet opening 25 which is larger than the open- -channel is prevented from contacting with the protective glass globe.

The globe 22 is further protected against becoming heated, by cool air entering the "openings 21 adjacent the lower peripheral edge of the globe, which air rises along the inner wall of the globe and thus provides, in effect, a layer of cool air between the protective globe and the excessively hot air within the interior of the fixture. The opening' 25 in the top o-f the protective globe is sufliciently large to exhaust both the air issuing from the refractor, through the opening 24, and that drawn into the interior of the globe through the openings 21.

As will be readily apparent, the provision of air inlet openings both at the base of the lamp and adjacent the lower edge of the protective globe provides maximum ventilating efficiency, as it is the base of the lamp and the outer protective globe which requires the greatest protection against heat.

The efficiency of the ventilation is further improved by increasing the velocity of the air moving through the fixture by providing a chimney structure indicated generally by the numeral 26. rlhis chimney structure may be of any suitable design and in Figure 1 is illustrated as comprising a glass cylinder 27 resting at its lower edge upon the protective globe portion surrounding an opening 25, and being held in position by a spider 28 whose arms engage the inner wall of the protective globe and into which a screw 29 is threaded. rlhe outer headed end of the screw passes through a hood 30 and a bushing 31 resting upon a screen 32.

The screen 32 obviously prevents the entrance of insects to the interior of the lixture, and the hood 30 is preferably projected sufliciently beyond the cylinder 27 to prevent rain from entering the globe. Screens 33 and 34 are also preferably provided at the air inlet openings 21 and 10, respectively, to preventthe entrance of insects to the interior of the fixture.

1f desired, the chimney structure maybe of the type shown in Figure 6. In this instance, the glass 27 is replaced by a metal cylinder 35 which likewise rests upon the peripheral edge of the opening 25 in the protective globe. The cylinder 35 is held on the protective globe by a plurality of clips 86 which engage under the peripheral edge of the globe and are secured to arms 37 carried by the clyinder and projecting inwardly to support a hub 38. The hub 38 is internally threaded to receive a screw 39 which serves to hold a hood 40 and a screen 41 in position over the top of the cylinder 35.

Encircling the cylinder 35 is a second cylinder 42 which is suitably supported from the inner cylinder by arms 48, and extends suficiently above the lower edge of the hood to prevent rain from driving beneath the hood and into the chimney structure.

The effectiveness of the air inlet port to the interior of the protective globe, which is afforded by the annular slots or openings 21, may be increased by providing a skirt or What is claimed as new and desired tol secure by letters patent is:

1. In a lighting fixture, a substantially cup shaped body member open at its top and provided with an air inlet opening in its closedV bottom,y lamp supporting means Within the body member adjacent its closed bottom adapted to receive the base of an incandescent lamp, whereby the base'of the lamp is near the air inlet opening, an. in-

' verted glass bowl having an air outlet opening in its closed tofp and positioned over the Open topyof the body member whereby air entering the inlet 'opening at the bottom of the body member and becoming heated bya lampv therein rises through the fixture to be exhausted through the air outlet opening, and means for supporting the inverted glass bowl from the open top portion of the body member-so as to provide a second air inlet opening adjacent the bottom rof lthe glass bowl, whereby cool' air is drawn ,into the xture to pass upwardly along'the inner wall ofthe glass bowl.

2. In a lighting fixture, an open topped body member, a lamp sup-ported within the body member with its base adjacent the bottom portion .of the body member, said body member having an air inlet opening adjacent its bottom to admit cool air to its interior adjacent the base of the lamp, a protective globe positioned over lthe open top of the body member, said protective globe having an opening in its top portion through which air drawn into the body member through said inlet opening and rising upon becoming heated bythe lamp is exhausted, and means providing a second air inlet opening adjacent the juncture of' the protective globe and the body member whereby cool air is drawn into the fixture to rise upwardly along the inner wall of the protective globe.

3. In a lighting fixture, an open topped body member having an air inlet opening in its bottom, an electric lamp mounted within the body member with its base adjacent the air inlet opening, a protective globe kpositioned over the open top of the body member with its lower peripheral edge adjacent the body member, perforate means for supporting the protective globe from the body member whereby a second air inlet opening is provided between the protective globe and the body member to admit air into the interior of the fixture, and said protective globe having an air outlet opening in its top portion through which air drawn into the lixture through both inlet openings is exhausted.y Y f 4. In a lighting fixture, an open. topped body member having an air inlet opening adjacent its closed bottom, an electric lamp mounted within the body member with its base adjacent the air inlet opening,.a protective globe having an air outlet opening at its top -portion and vpositioned over the i lopen top of the bodymember withv its lower peripheral edge spaced from the body member, an annular flange extended laterally from thebody portion to support the prof; tecting globe, and said annular liange having openingsl which providev a second air inlet opening and through which cool air is drawn to rise upwardly along the inner wall of the protective globe and be exhausted through the opening at its top portion;-

5. In a lighting fixture, anopenltopped body member having an air inlet opening adjacent its closed bottom, an electric lamp mounted within the body vmember with its base adjacent the airinlet opening, a protective globe having an air outlet opening vin its top portion andA positioned over the open top of the body member `with= its lower peripheral edge spaced from the adjacent portion of the body member, Vand perforate means'for supporting the protective globe from the body member to provide a second air inlet openingthrough which airy enters the interior of the fixture to rise upwardly by the heat of the lamp and pass over the inner wallof the protective globe andwhere by air entering the `air inlet opening at the base of the lamp land -rising through vthe 1 center of the fixture is prevented from contacting `with the protective globe.

6. In alighting fixture, a.- substantially open topped body member having an air inlet opening at its closed bottom, an elecy. tric lamp mounted within the body member with its basenear the air inlet opening, a protective globe positioned over the open top of thel bodymember andhaving an air outlet opening in its top portion whereby air entering the inlet opening at the base of the lamp rises due to theheat of the lamp and is exhausted through the air outlet opening,A andmeans for admitting additional air *to the interior of the fixture adjacent the juncture of the protective' globe'vwithl the body member to provide alaye'r of cool vair between the protective'giobe and thehea'ted air rising through the center of'the fixture.

l7. In a lighting lixture,ran openftopped body member having an air inlet opening adjacent its bottom, an electric lamp mounted within the body member with its base near the air inlet opening, a refractor bowl positioned over the open top of the body member with its lower peripheral edge substantially contacting with the top of the body member whereby the reractor bowl forms substantially a continuation of the body member, said retractor bowl having an opening in its top portion through which air drawn into the inlet opening and heated by the electric lamp is exhausted, a protective globe surrounding the refr-actor bowl but spaced therefrom and having its lower peripheral edge portion spaced from .the body member, said protective globe having an exhaust opening in its top portion through which the air issuing from theretractor bowl passes, and means for supporting the protective globe from the body member so as to maintain a space therebetween and provide a second air inlet opening through which cool air is drawn to pass upwardly along the inner wall of the protective globe and out through the outlet opening at its top.

8. In a lighting fixture, a substantially cup shaped body member, an electric lamp mounted within the body member, a refractor bowl positioned over the open top of the body member to, with the body member, substantially enclose the lamp, a protective globe positioned over the retractor bowl, with its lower peripheral edge portion spaced from the refractor bowl and having an air outlet opening at its top, the space between the lower peripheral edge portion of the protective globe and the reitractor bowl providing an air inlet opening through which cool air is drawn to rise upwardly along the inner wall of the protective globe and be exhausted through the outlet opening at its top, and single means for readily removably mounting the protective globe and the refractor bowl from the top portion of the body member with therefractor bowl substantially contacting with the body member when in its normal position over the body member to close ofi communication between the interior' of the body member and theinterior of the protective globe.

9.In a lightingk ixture, a substantially cup shaped body member having an air inlet opening in its bottom, an electric lamp mounted within the body member with its base near the air inlet opening, a refractor bowl positioned over the open top of the body member and .substantially contacting therewith to, with the body member, enclose the lamp, said retractor bowl having an air outlet opening'in its top whereby the body member and the refractor bowl form a ychamber through which Ventilating air entering the air inlet opening rises to prevent over-heating of the lamp and its supporting structure, a protective globe positioned over the refractor bowl and having an air outlet opening above the outlet opening in the retractor bowl to exhaust the air issuing from said refractor bowl outlet, andmeans mounting. the protective globe from` the body member with its lower peripheral edge portion spaced therefrom to provide a secondY air inlet opening communicating with the space between the protective globe and the retractor bowl, said space providing a second air passage entirely surrounding the first mentioned air passage through which air rises in .Contact with the inner wall of the protective globe to pass upwardly through the opening in its top.

l0. ln a lighting fixture, a cup shaped body member open at itsrtop, an electric lamp mounted within the body member, a refractor bowl substantially engaging the open top of the body member to forma continuation thereof and with the body member enclose the lamp, an annular flange extended from the top portion of the body member, said annular flange vhaving a plurality of screened air passages, ay protective globe positioned over the refractor bowl and having an air outlet opening in its top, and means for mounting the protective globe from said annular flange with its llower peripheral edge outwardly of the screened air passages in the annular flange, whereby air passing through the screened openings in the flange enters the space between the protective globe and the refractor bowl to rise upwardly in contact with the inner wall of the protective globe and pass through the opening in its top.

In testimony whereof. l have hereunto' atlixed my signature.

JOHN n. GHARTRAND. 

